VMS Help POSIX Threads, PTHREAD routines, pthread_exc_set_status_np, Description  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    This routine associates a system-specific status value with the
    specified address exception object. This transforms the address
    exception object into a status exception object.

    The exception argument must already have been initialized with
    the exception package's EXCEPTION_INIT macro.

    Use this routine to associate any system-specific status value
    with the specified address exception object. Note that any
    exception objects set to the same status value are considered
    equivalent by the Threads Library.